I just purchased and installed the T2 Software.  Rolled forward the 2016 return and completed the 2017 return.  Auditor is saying the year end date is past the submission date, which it isn't.  I saved and closed the file and the software.  when I reopened the 2017 software, my 2017 file was gone.  I searched all my folders.  Out of frustration I opened the 2016 software and the file was there and able to be opened in the older software.  Not sure what is happening as I have used Turbo tax personal and corporate for a lot of years and have not seen this before.